Improved stone-dressing machine



for regulating the movements and position of a trip-ham- `is affixed a belt-drum on its outer end.

f tutta @tutti MMM- A. M. -GEoRGnor- NAsHUA, NEW HAMPSHIRE, AssiGNoR iro HIM- sanr- ANDv r. Groes, oF sAME. PLAGE.A Y

Letters Patent No, 87,483, dated March 2, 1.7869.

IMPR'ovED airone-DRESSING Madame.

The Schedule referred to these Letters Patent and making part o! the same.

To 'all whom it lmay c'ancern:

Be it known that l', A. M. GEORGE, of Nashua, in the county of Hillsborough, and State of New Hampshire, have invented a new and valuable Improvement in Stone-Dressing Machines; and I do'hereby declare* that the following is a full, clear, and err-act description of the construction and operation of the same, refer-y ence being had to the annexed drawings, making a part of this specification, and to the letters and figures of yeference marked thereon.

Figure l of the drawings is aplan view of my' stonedresser.

' Figure 3 is a sectional view thereof, and

Figure 2 shows details.

,My invention relates vto machines for dressing the surface of stones; and v It consists mainly in constructingand arranging devices by which a trip-hammer is madel to perform the workpf an ordinary hammer upon such stone-surfaces.

It also consists in providing novel and eiiicient means mer upon the stone, and of moving the stone itself.

` The letter A of the drawings represents a base-board or platfbrm,1'1pon\vhich the stone-carriage is moved.

Letter B is thefcarriage, and

O, the stone placed thereon for dressing.

The under side of the carriage B is provided with cogs, as shown in fig. 3, and the letter a is a working therein.4 l

Two upright posts D areLadjusted to the side of the platform at the points indicated, vand two long curved slotted posts, with a ratchet on their rear curved sides, are adjusted to the s idesof the rear end of the platform.

' |These last-named posts are marked E on the draw.- in

s. Y v he letter c is a sh'aft adjusted under the platform, upon which the pinion ay is attached, and to which, also,

`I construct a side frame, F, and attach it to the side of the mainframe of the machine.4 j v In this side frame, l ax ashaft, and adjust thereon the drums'fl and e', as represented.4

These lastnamed drums 'are designed to hold and actuate belts, by which they are connected with the drum on theend of shaft c, and the drum on the end of shaft H, hereinafter mentioned.

The letter VK is a trip-hammer, adjusted as shown, andletter tis a spring extending from a point near the rear ofthe hammer-handle to a point opposite the front end thereof', passing over the cross-bar o, by means of which its elastic otiice is secured in raising the hammer or chisel from the stone in a sharp, quick movement.

Theworkinghammer or chisel is attached to the front end of this spring by means of clamps and screw, as shown by letter hin tig. 2, while the hammer proper,

pinioneon the front end of the handle, is adjusted immediately over the top th ereof, and strikes it with each downward movement.

The letter s' isa round bar that passes through the handle of the hammer, and upon which 'said handle may be moved sidewise in either direction, as hereinafter' mentioned VThe letter u is a clasp fitted over the bar s, on each side of the hammer-handle, and has an upright stem, to which the lever L is attached, as hereinafter stated..

The lever L is pivoted upona cross-bar raised above the main frame, as shown, and is constructed with a slot in'its rear end,adapt`ed to receive and actuate the stem' o f clasp c1, above described.

To move the hammer either to the right or left upon; the stone, the operator moves the lever to the right or left, as the case may require, thereby moving the hammer-handle' upon the bar s.

The letter H is a shaft, having a beltvdlum on its rear end, and another main drum or *driving-wheel on its front end, or it has' a' crank on its front end, as the case may be.

That portionof this shaft between the sides of the main frame is tinted, as shown in tig. 3, and adapted to catch upon the rear end of the hammer-handle with each tinted bar, and serves to press the same downward, and thereby vraise the hammer from the stone.

When these tinted bars, respectively,have pressed the rear end of the hammer downward to the point at which contact is passed, the hammer falls on the stone and performs its work. I

-This process'is repeated ordinarily four times at'each revolution ofthe shaft H, but the number may be increased or` diminished, at'will, by increasing or diminishingthe number of iluted bars 'on the shaft. r The side pieces of the main frame of the machine y are hinged at their forward ends, while in their rear ends I adjust a shaft and pinion,-P, which operate with the ratchets on the rear sides of curved posts E,

as shown in the drawings.

- These last-named shaft-pinions and ratchets serve as means for raising or lowering the frame, at the will,

of the operator, and thereby adjusting it to the necessities of the case. y

For the purpose of regulating the distance of the.` rear end of the hammer-handle from the shaft H, I

.construct an adjustable plate, and attach it to the rear The spring i is attached kto the clasp u, and is always moved, with the hammer-handle upon its arbor, by the lever L. v

What I claim as my invention, and desire to secure by Letters Patent, is-

l. Raising or lowering the frame of astone-dressing machine by means of ratchets and pinions, substantially as set forth.

2. `The bar s, clasp u, and lever L, constructed, arranged, and eperatin;t substantially as and for the purposes herein specie l 

